Optimal fluid therapy in severe falciparum malaria has not been well defined, especially in resource poor settings where access to mechanical ventilation is limited. Recent studies suggest that liberal fluid resuscitation is harmful for severe malaria patients despite they often being hypovolemic on admission. In order to elucidate the minimum fluid therapy required to prevent complications in severe malaria, we will conduct a prospective observational study in adults with severe malaria, and also in adults with severe sepsis as a comparison group. The objective of this study is to describe the association between hemodynamic variations in conventional fluid management and the probability of developing acute kidney injury (AKI) or pulmonary edema in adults with severe malaria and severe sepsis. Hemodynamic measurements will be obtained by using transpulmonary thermodilution and arterial pulse contour analysis.